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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 9/16 // - 9/16
12/x-(9/16) = 0
12/x-9/16 = 0
12*x^-1 = 9/16 // : 12
x^-1 = 3/64
-1 < 0
1/(x^1) = 3/64 // * x^1
1 = 3/64*x^1 // : 3/64
64/3 = x^1
x = 64/3
x = 64/3
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